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  #1  
Old 09-22-2009, 10:08 AM
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GPSHSLAX GPSHSLAX is offline
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Default Tire Pressure

This is a debate I've had with friends in the past. Do you pump your tires up to the Vehichle manufacturer recomendation (ie. the door sticker) or the tire manufacturer recomendation.

I've always pumped the tires up to the max stamped on the tire. In fact I didn't even know there was a door sticker for about the first 5 years I was driving.

What do you all do, and what considerations are going into your decision (if any).
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Old 09-22-2009, 10:31 AM
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I am a max on the side of the tire guy. 2 reasons: You will get slightly higher fuel economy (1-5%) due to the firmness creating lower rolling resistance with the tradeoff being a harsher ride. Second, here in parts of the country that have to deal with snow in the winter, the higher pressure keeps the tread spread open for better grip. The second reason come from my grandfather who spent over 30 years in a tire shop.
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Old 09-22-2009, 10:42 AM
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I go with the tire guys. Let's face it, the vehicle manufacturer knows dick about the tires you're putting on the truck, so how can they make a recommendation. A tire manufacturer knows it's yield limits on the rubber, tread design, and max rotating speed so they know what pressure it should run at.
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Old 09-22-2009, 11:05 AM
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Quote:
Originally Posted by GPSHSLAX View Post
This is a debate I've had with friends in the past. Do you pump your tires up to the Vehichle manufacturer recomendation (ie. the door sticker) or the tire manufacturer recomendation.

I've always pumped the tires up to the max stamped on the tire. In fact I didn't even know there was a door sticker for about the first 5 years I was driving.

What do you all do, and what considerations are going into your decision (if any).
I deal with customers everyday that come in with blowouts due to over inflation of their tires....and they demand to be given a new tire for free claiming a defect, and they never get it...It is not safe at all to over inflate your tires....The amount on the side of the tire is the MAX that the tire can handle...different cars with the same tire take a different amount of psi because of the weight difference of the individual cars/trucks...and overinflation can cause improper tire wear that will also not be covered under warrenty...
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Old 09-22-2009, 11:06 AM
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Quote:
Originally Posted by MikeD View Post
I am a max on the side of the tire guy. 2 reasons: You will get slightly higher fuel economy (1-5%) due to the firmness creating lower rolling resistance with the tradeoff being a harsher ride.
I'm with you here. That's reason one I keep them pumped up. My wife does not like the harsher ride on her vehichle but I usually pump her's up when she isen't around or just tell her I'm checking the preasure and pump them up anyway.

Quote:
Originally Posted by CdnoilRAM View Post
Let's face it, the vehicle manufacturer knows dick about the tires you're putting on the truck, so how can they make a recommendation.
This is reason two for me. Even when you have the stock tires on the Vehichle manfacturer seems to be making stuff up too me.

I think we all remember the Firestone debacle with tires blowing out and SUV's rolling and killing people. As I recall, aside from the defect in the tires, ford was recommending an inflation of something like 22 PSI! Firestone claimed, that even with the defect, if the tires had been properly inflated they wouldn't have failed.

That just affirmed my opinion that I should do what the tires say.
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Old 09-22-2009, 11:06 AM
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Just like they said above, go with tire's specs. That sticker on the door just makes an Dodge (over paid) engineer feel special.
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Old 09-22-2009, 11:13 AM
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Quote:
Originally Posted by CdnoilRAM View Post
I go with the tire guys. Let's face it, the vehicle manufacturer knows dick about the tires you're putting on the truck, so how can they make a recommendation. A tire manufacturer knows it's yield limits on the rubber, tread design, and max rotating speed so they know what pressure it should run at.
The PSI on the side of the tire is the MAX amount that tire can hold without any pressure being put on it from the vehicle and the temp of the tire while driving...You increase your chances of a blowout, and severe tire wear if you leave your tires at the max amount on the side of the tire and not the manufacturer specs....
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Old 09-22-2009, 11:24 AM
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Quote:
Originally Posted by GPSHSLAX View Post
I'm with you here. That's reason one I keep them pumped up. My wife does not like the harsher ride on her vehichle but I usually pump her's up when she isen't around or just tell her I'm checking the preasure and pump them up anyway.



This is reason two for me. Even when you have the stock tires on the Vehichle manfacturer seems to be making stuff up too me.

I think we all remember the Firestone debacle with tires blowing out and SUV's rolling and killing people. As I recall, aside from the defect in the tires, ford was recommending an inflation of something like 22 PSI! Firestone claimed, that even with the defect, if the tires had been properly inflated they wouldn't have failed.

That just affirmed my opinion that I should do what the tires say.
so what your saying is that overinflating your tires to upwards of 40-50psi is safer than a pos tire that had 22psi in it???? What sense does that make??? your putting more pressure on the tire with overinflation, then add in the weight of the vehicle, and then add in the temp increase while driving....your just asking for a blowout while driving....
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Old 09-22-2009, 11:33 AM
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Quote:
Originally Posted by CHILLZ HEMI View Post
The amount on the side of the tire is the MAX that the tire can handle...different cars with the same tire take a different amount of psi because of the weight difference of the individual cars/trucks...and overinflation can cause improper tire wear that will also not be covered under warrenty...
This is my buddies argument exactly. I've never seen bad wear on my tires due to pressure. I did have a set tires on an old sedan that I drove till the belts wore threw but whats something else entirely.

The folks coming into your shop, were they pumped up to the max preasure or past the max preasure on the tire? I am just curious what you mean by overinflated.
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Old 09-22-2009, 11:37 AM
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Quote:
Originally Posted by GPSHSLAX View Post
This is my buddies argument exactly. I've never seen bad wear on my tires due to pressure. I did have a set tires on an old sedan that I drove till the belts wore threw but whats something else entirely.

The folks coming into your shop, were they pumped up to the max preasure or past the max preasure on the tire? I am just curious what you mean by overinflated.
over inflation is considred to be over the recommended PSI from the vehicle manufacturer...if a truck calls for 35psi, but the tire says 44psi, putting in anything over 35 psi is over inflation...And the customers i have a various experiences with, ranging from putting in the PSI that is on the side of the tire, to putting up to 10 psi over the MAX amount that the tire is recommended for...
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